The Verizon iPhone 4 isn’t the only thing that Apple is touting in its recent commercials -- the company has just unveiled their latest showcasing the iPad, which Cupertino reminds us is an “iconic” device.

With the annual Macworld Expo upon us, iPhone-wielding fans of all things Apple will descend upon our beloved San Francisco. For those of you who’ll be joining us, we’ve put assembled a short list of must-have apps. Load these on your ’Phone or ’Pad and you’ll confidently navigate the City’s many splendors. Might want to load these before you arrive, though. AT&T’s 3G coverage here is less than ideal, and with the VeriPhone still weeks away, you could find your evening slipping away while your downloads trickle in. Oh and one bit of advice: don’t ever ever use the term “Frisco.”

Yes, that's right, other than the five minutes of novelty and the hours of torture for everyone around you that an iOS application like Cat Piano can provide, it seems that one can also turn it towards loftier pursuits... like riffing on Katy Perry. In what could easily be the best video you see all day, an intrepid YouTube user has managed to pull together a very respectable cover of Perry's "Teenage Dream," playing every part of the song on his iPad.

When you’re done playing around with the iPhone’s many great games, consider goofing around with some of these quirky and often silly conversation-starting apps. Whether you’re using the iPhone to modify your voice or photos, or to simply trigger visual or audio gags, these options will keep you and your friends entertained.

A few months back, Adobe mentioned that they were ditching the development of Project ROME and throwing their resources into the development of applications for tablets, including iOS devices. With that in mind, you might want to consider taking a peek at what Adobe's free Photoshop Express, which was updated to version 1.5 yesterday, can do for you.

We’ve heard rumors that Apple is working on a near-field communication (NFC) payment system for the iPhone before, but new details have emerged that may allow users to pay for goods and services with their iTunes account.